Js的学习第十一天

依旧是课堂的内容

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        .nav{
            width: 325px;
            margin: 100px auto;
            list-style: none;
        }
        .nav>li{
            float: left;
            width: 80px;
            height: 35px;
            line-height: 35px;
            text-align: center;
        }
        li{
            list-style: none;
            cursor: pointer;
        }
        .nav ul li{
            border: gold solid 1px;
        }
        .nav ul{
            display: none;
        }
        .nav>li:hover{
            background-color: #ccc;
        }
        .nav ul li:hover{
            background-color: #ccc;
        }
    </style>
</head>
<body>
    <ul class="nav">
        <li>微博
            <ul>
                <li>nima</li>
                <li>@wo</li>
                <li>123</li>
            </ul>
        </li>
        <li>私信
            <ul>
                <li>@nima</li>
                <li>hhh</li>
                <li>111</li>
            </ul>
        </li>
        <li>手机
            <ul>
                <li>@nima</li>
                <li>hhh</li>
                <li>111</li>
            </ul>
        </li>
        <li>邮箱
            <ul>
                <li>@nima</li>
                <li>hhh</li>
                <li>111</li>
            </ul>
        </li>
    </ul>
</body>
<script>
    var nav = document.querySelector('.nav');
    var lis = nav.children;
    // 鼠标移入显示
    console.log(lis);
    for(var i = 0;i < lis.length;i++){
        lis[i].onmouseover = function(){
            this.children[0].style.display = 'block';
        };
        lis[i].onmouseout = function(){
            this.children[0].style.display = 'none';
        };
    }
</script>
</html>
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        textarea{
            width: 300px;
            height: 150px;
            border: 1px solid black;
            padding: 10px;
            resize: none;
        }
    </style>
</head>
<body>
    <textarea></textarea>
    <button>Click me</button>
    <ul></ul>
</body>
<script>
    var btn = document.querySelector('button');
    var txt = document.querySelector('textarea');
    var ul = document.querySelector('ul');
    btn.onclick = function(){
        if(txt.value == ''){
            alert('Please enter some text');
        }
        else{
            var li = document.createElement('li');
            li.innerHTML = txt.value+ "<a href='javascript:;'>Delete</a>";
            ul.insertBefore(li, ul.children[0]);
            var as = document.querySelectorAll('a');
            for(var i = 0; i < as.length; i++){
                as[i].onclick = function(){
                    ul.removeChild(this.parentNode);
                }
            }
        }
    }
</script>
</html>
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        /* 让p标签显示在输入文本框的左边 */
        .nav{
            width: 400px;
            height: auto;
            margin: 100px auto;
            position: relative;
            border: 1px solid #ccc;
        }
        .nav span{
            text-align: center;
            float: left;
        }
        .cont table{
            width: 300px;
            position: relative;
            border: black solid 1px;
            border-radius: 5px;
        }
        .cont table tr{
            height: 30px;
            text-align: center;
        }
        /* 将选择器放在邮箱输入框的右边 */
        .nav select{
            position: absolute;
            right: 0;
            top: 0;
            width: 100px;
            height: 30px;
            border: none;
        }
        /* 美化按钮 */
        button{
            width: 100px;
            height: 30px;
            border: none;
            background: #ccc;
            cursor: pointer;
            border-radius: 5px;
            color: #333;
        }
        /* 美化表格 */
        .cont table tr td{
            border: black solid 1px;
            padding: 5px;
        }
        /* 第一列背景色为灰色 */
        .cont table td:nth-child(1){
            background: #ccc;
        }
        /* 第二列背景色为红色 */
        .cont table td:nth-child(2){
            background: red;
        }
    </style>
</head>
<body>
    <div class="nav">
        <span>请输入姓名：</span>
        <input type="text" id="name">
        <br>
        <span>请输入邮箱：</span>
        <input type="text" id="email">
        <br>
        <!-- 添加下拉菜单，用于选择邮箱后缀 -->
        <select id="emailSuffix">
            <option value="@gmail.com">gmail.com</option>
            <option value="@yahoo.com">qq.com</option>
        </select>
        <button>Add Table</button>
        <div class="cont">
            <table>
                <tr>
                    <td>姓名</td>
                    <td>邮箱</td>
                </tr>
        </div>
    </div>
    <script>
        document.addEventListener('DOMContentLoaded', function () {
            // 鼠标点击事件
            var btn = document.querySelector("button");
            // 获取名字输入框的元素和邮箱输入框的元素
            var name = document.querySelector("#name");
            var email = document.querySelector("#email");
            var emailSuffix = document.querySelector("#emailSuffix");
            // 注册事件
            btn.onclick = function () {
                if (name.value == "" || email.value == "") {
                    alert("请输入姓名和邮箱");
                } else {
                    var fullEmail = email.value + emailSuffix.value;
                    console.log(name.value);
                    console.log(email.value);
                    var tr = document.createElement("tr");
                    var td1 = document.createElement("td");
                    var td2 = document.createElement("td");
                    td1.innerHTML = name.value;
                    td2.innerHTML = fullEmail;
                    // 添加元素
                    tr.appendChild(td1);
                    tr.appendChild(td2);
                    // 添加到表格中
                    document.querySelector(".cont table").appendChild(tr);
                    // 清空输入框
                    name.value = "";
                    email.value = "";
                }
            }
        });
    </script>
</body>
</html>